[MD] Use strong call to action styling on solitary infobar buttons.

chrome/browser/ui/views/infobars/confirm_infobar.cc

Index: chrome/browser/ui/views/infobars/confirm_infobar.cc
diff --git a/chrome/browser/ui/views/infobars/confirm_infobar.cc b/chrome/browser/ui/views/infobars/confirm_infobar.cc
index d73d27c5382152c260369b9ab2fd25cd57f37ea1..37fc402bd101f29ee9c73ebd35235ea5a5dbf997 100644
--- a/chrome/browser/ui/views/infobars/confirm_infobar.cc
+++ b/chrome/browser/ui/views/infobars/confirm_infobar.cc
@@ -74,12 +74,7 @@ void ConfirmInfoBar::ViewHierarchyChanged(
       if (ui::MaterialDesignController::IsModeMaterial()) {
         views::MdTextButton* button = CreateMdTextButton(
             this, delegate->GetButtonLabel(ConfirmInfoBarDelegate::BUTTON_OK));
-        // If this is the only button, weak call to action. Otherwise, strong
-        // call to action.
-        button->SetCallToAction(
-            delegate->GetButtons() == ConfirmInfoBarDelegate::BUTTON_OK
-                ? views::MdTextButton::WEAK_CALL_TO_ACTION
-                : views::MdTextButton::STRONG_CALL_TO_ACTION);
+        button->SetCallToAction(views::MdTextButton::STRONG_CALL_TO_ACTION);
         ok_button_ = button;
       } else {
         ok_button_ = CreateTextButton(
@@ -99,12 +94,9 @@ void ConfirmInfoBar::ViewHierarchyChanged(
         views::MdTextButton* button = CreateMdTextButton(
             this,
             delegate->GetButtonLabel(ConfirmInfoBarDelegate::BUTTON_CANCEL));
-        // If this is the only button, weak call to action. Otherwise, no call
-        // to action.
-        button->SetCallToAction(
-            delegate->GetButtons() == ConfirmInfoBarDelegate::BUTTON_CANCEL
-                ? views::MdTextButton::WEAK_CALL_TO_ACTION
-                : views::MdTextButton::NO_CALL_TO_ACTION);
+        // Apply CTA only if the cancel button is the only button.
+        if (delegate->GetButtons() == ConfirmInfoBarDelegate::BUTTON_CANCEL)
+          button->SetCallToAction(views::MdTextButton::STRONG_CALL_TO_ACTION);
         cancel_button_ = button;
       } else {
         cancel_button_ = CreateTextButton(